Turner County herald. (Hurley, Dakota [S.D.]) 1883-19??, 1887-10-20
POPULAR SCIENCE.

BY careful experiments M. Bloch has
determined that it takes 1.72 Of sec
ond longer to hear sound than to see
sight, and 1.21 Of second longer to
feel touch than to see sight.
CHEMICAL decomposition has been
produced by pressure in the expert.
ments of two Belgian chemists. Under
pressure of 5000 atmospheres, at
Temperature of 104 degrees, pulyer-
lied acetate of copper and lime was
slowly liquefied, and on removal of the
pressure the surface of the instrument
i'll contact with the salt was coated with
copper.
A VALUABLE practical fact receives
additional support from experiments
on the influence of sunshine upon the
vitality OF the germs of microbes as
conducted by NJ. E. Duclaux. He cul-
tivated Iyrothrir scaber in milk and
Liebig's extract, and found that the
light OF the sun is fifty times more de-
structive than its heat, thus fully con-
firming its hygienic properties.
A THEORY of solution has been
brought forward by Mr.. w. W. Nicol,
OF the Royal Society, Edinburgh. So
luton of q salt in liquid results from
the attraction of the molecules of the
liquid for molecule of the salt exceed
ing the attraction of the molecules of
the salt for one another. Saturation
ensues when these attractions are bal
anced. The theory explains variation
of solubility with rise of temperature.
NJ. MANDN, distinguished natural
ist, tells the French Academy of Sci
ence that severe earthquake phenom-
ena only occur in districts destitute OF
forest growth which might serve to dis
charge the atmospheric electricity.
Earthquake phenomena he therefore
attributes to the resistance offered by
the earth's crust to the electricity gem
Grated in the globe itself. Whether
these facts accord with those in associa-
tion with American experiences, we
are not prepared to state.
PROF. HARVEY w. WILEY has been
long in the employ of the Agricultural
Department at Washington, endeavor-
ing to master the whole subject of
sugar from sorghum. He concludes
that the formation of sucrose by the
plant is only an accidental or adventi-
tious process, and only occurs from
waste material. He concludes from
this fact that sugar from sorghum will
never be an industry that any one can
long engage in, as the results will be
more or less accidental. Sometimes
plants may yield good percentage of
sugar. at other times none at all.
IT has been laid down by M. Chev-
reul that the human eye cannot be
long employed in the perception of
given color without tending to become
and to arouse an impression
similar to that ordinarily produced by
the perception of white light. Dr..
Beclard has also noticed that when the
eye is directed for time upon a coll
ored field, the other eye being closed,
if the eye which was open be in turn
closed and the other opened specter
OF the complementary color will be per-
ceived; thus, if the right eye has OBJ
served a red disk, the left being shut.
a reversal of this state of things would
result in the perception Of q green
disk by the freshly opened left eye. In
virtue of the same property of the eye,
when two tints are placed beside each
other the nearest edge of the one will
appear as though deprived of all the
colored rays which it may have in com.
mon with the other. Analogous effect
is produced with grays non-colored,.
that Is to say, formed simply Of white
md blank.